WO2024252253A1 - Ensemble de verrouillage de platine, système de verrouillage de platine, procédés d'assemblage et de démontage dudit système, machine à tricoter - Google Patents

Ensemble de verrouillage de platine, système de verrouillage de platine, procédés d'assemblage et de démontage dudit système, machine à tricoter Download PDF

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Publication number
WO2024252253A1
WO2024252253A1 PCT/IB2024/055396 IB2024055396W WO2024252253A1 WO 2024252253 A1 WO2024252253 A1 WO 2024252253A1 IB 2024055396 W IB2024055396 W IB 2024055396W WO 2024252253 A1 WO2024252253 A1 WO 2024252253A1
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WO
WIPO (PCT)
Prior art keywords
sinker
cylinder
insert
fixed
inserts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2024/055396
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English (en)
Inventor
Claudio GERRI
Simone GERRI
Lorenzo COLOSIO
Claudia GERRI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gerri Srl
Original Assignee
Gerri Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gerri Srl filed Critical Gerri Srl
Publication of WO2024252253A1 publication Critical patent/WO2024252253A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/14—Needle cylinders
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/06—Sinkers

Definitions

  • the present invention relates to a sinker locking system for a circular knitting or hosiery machine , in particular for a single j ersey machine , and more speci fically a sinker locking assembly .
  • the present invention relates to a circular knitting machine , preferably a single j ersey knitting machine , comprising such a sinker locking system .
  • the present invention relates to a method for assembling and disassembling said sinker locking system .
  • the working of yarns allows tubular products of any kind and si ze to be obtained .
  • the working is performed by means of the rotation of the cyl inder, together with the controlled and synchroni zed movement of a plurality of needles and a series of sinkers , positioned on said cylinder, which, working on the threads , generate knitting stitches according to more or less predefined patterns .
  • the needles are generally arranged parallel to the central axis of the cylinder, all about the side wall thereof , and are moved by means of the most diverse cam systems , so that they undergo controlled oscillating vertical translations .
  • Such needles are suitable for automatically capturing the thread .
  • the thread is fed transversely, and the feed reels are placed on the upper frame of the machine or on a side creel ; before arriving at the needles , the thread follows a rather long path through tension regulators and stop devices suitable for locking the work in case the thread breaks .
  • the sinkers are usually arranged transversely to the axis of the cylinder, in particular, at the upper base thereof , according to a radial orientation .
  • each sinker is interposed between two needles .
  • the sinkers are basically flat elements that act as a "bridge" between one needle and the next and allow for the creation of each knit stitch .
  • Some known systems also provide for sinkers to be moved in radial translation by cam systems to cooperate with the eyes of the nearest vertically translating needles .
  • the sinkers and the entire cylinder become very dirty due to the movement , which entails the risk of compromising the cleaning of the thread and the partially proces sed piece .
  • This inconveniently, therefore requires frequent cleaning of said cylinder, with consequent waste in terms of resources , as well as signi ficant machine downtime .
  • a further disadvantage of movable sinker systems consists in the fact that the sliding of the thread combined with the translation of the sinker involves a wear phenomenon that is widespread on the felling surface of the sinker, which makes it completely unusable after the maximum working cycles of the proj ect .
  • each fixed sinker insert is mounted on the cylinder by clip coupling or similar types of locking . That is , each fixed sinker insert comprises a coupling tooth suitable for being inserted by force or snap coupling into a respective receiving portion of the cylinder .
  • each of these inserts must be mounted individually on the cylinder .
  • the assembly of such inserts is expensive , impractical , and time-consuming .
  • these inserts are suitable for use only on a dedicated machine , specially modi fied to support the coupling of such inserts .
  • the current fixed sinker system is therefore not applicable for performing the retro- fitting of traditional knitting machines without requiring a complete re-design .
  • the coupling o f these fixed s inker inserts generates irreversible deformations on said inserts , which prevent a second application . That is , once the insert has been coupled, following its removal , it is no longer possible to reuse it .
  • these two-piece sinker systems provide for a double slit , one for the fixed s inker insert and one for the movable sinker insert , made side by side in the circumferential direction .
  • such systems require the creation of two adj acent slits in a circumferential direction between each pair of contiguous needles .
  • the obj ect of the present invention is to provide a locking system which facilitates and speeds up the assembly of the sinkers .
  • a further obj ect of the present invention is to provide a locking system which may also be applied to traditional machines , i . e . which allows the retrofitting thereof .
  • a still further obj ect is to provide a sinker locking system that makes it possible to reuse the sinkers after their extraction .
  • FIG. 1 is a sectional view of a sinker locking system for a knitting machine according to an embodiment of the present invention
  • FIG. 2 is a perspective view of a sinker locking system for a knitting machine according to an embodiment of the present invention
  • Fig . 3 is a sectional perspective view of a sinker locking system for a knitting machine in an embodiment of the present invention
  • FIG. 4 is a sectional perspective view of a portion of a sinker locking system for a knitting machine in an embodiment of the present invention.
  • the present invention refers to a sinker locking assembly for locking fixed sinker inserts 5 for a circular knitting machine, preferably single jersey.
  • the sinker locking assembly comprises a hollow knitting cylinder 1 extending with an inner side wall 11 and an outer side wall 12 along and about a central axis Z, between an upper base la and a lower base.
  • the sinker locking assembly comprises a single knitting cylinder 1 (i.e., it is suitable for applications on single jersey machines) .
  • the cylinder 1 has a central through cavity, also extending along and about said central axis Z .
  • each element will be defined, to promote clarity and conciseness of description, with respect to a reference system identified by the positioning of the cylinder in space, i.e., a cylindrical reference system. That is to say, once the central axis Z has been identified, an axial direction will be referred thereto. Furthermore, any direction perpendicular to said central axis and having a point in common with said central axis will be defined as the radial direction R. The circumferential direction, meanwhile, will be the direction identified by a side wall of said cylinder.
  • the cylinder 1 is operable in rotation about said central axis Z.
  • the cylinder 1 is shaped to support a plurality of knitting needles on its outer side surface, i.e., in technical jargon, the cylinder 1 is shaped to support a bed of needles. Said needles are suitable for being moved in vertical translation, i.e. parallel to the central axis Z, preferably by cam kinematic mechanisms.
  • the aforesaid needles slide in special respective vertical channels made in the outer side surface of the cylinder 1 .
  • This description wi ll not dwell on the movement of the needles and the shape of said channels , which are well known to a person skilled in the art .
  • the sinker locking assembly also comprises an inner clamping crown 3 , comprising a crown body 31 which extends about said central axis Z inside said cylinder 1 and from which a clamping flange 32 that faces the upper base la of the cylinder 1 proj ects circumferentially in a radial direction R transverse to said central axis Z .
  • the clamping crown 3 has a smaller diameter than the outermost diameter of the cyl inder 1 .
  • the clamping crown 3 is constrainable to the cylinder 1 so as to clamp a plurality of fixed sinker inserts 5 at least partially interposed between said clamping flange 32 and the upper base la o f the cylinder .
  • the clamping crown 3 is constrainable to the cylinder 1 at the inner side wall 11 of the cylinder 1 by means of fastening elements 8 .
  • the clamping crown 3 has a side wall 31 in which through holes 300 are obtained, suitable for matching with respective fastening seats 100 obtained on the inner side wall 11 of the cylinder 1 , and the fastening elements 8 are screws clamped in said fastening seats
  • Each fixed sinker insert 5 of said fixed sinker inserts 5 extends in the radial direction R between a head end 5a facing the central axis Z and a tail end 5b opposite said head end 5a .
  • Each fixed sinker insert 5 comprises , at the head end 5a, a locking protrusion 51 suitable to be interposed and clamped between the clamping flange 32 and the upper base la of the cylinder 1 .
  • the fixed sinker insert 5 is a shape obtained from a thin plate .
  • each fixed sinker insert 5 comprises , at said head end 5a, a felling protrusion 52 which remains at least partially axially spaced - i . e . , in the direction parallel to the central axis Z - with respect to the locking protrusion 51 and which is suitable for being raised above the clamping flange 32 when the inner clamping crown 3 is constrained to the cylinder 1 .
  • the felling protrusion 52 and the locking protrusion 51 are shaped to form a kind of C in the radial plane , i . e . to delimit an inner recess suitable to accommodate the clamping flange 32 of the crown 3 when this is in the locked condition .
  • the aforesaid felling protrusion 52 is delimited at the top by an upper edge 500 which identi fies an area for loop formation ( or felling) .
  • the thread being worked in the knitting machine is suitable for resting on and sliding on said upper edge 500 .
  • each radial slit 350 has a thickness less than the overall height of the felling protrusion 52 .
  • the clamping flange 32 is delimited at the bottom by an abutment surface 320 facing the upper base la of the cylinder 1 .
  • the annular pad 7 directly faces the locking protrusion 51 of the fixed sinker insert 5 and, in the locked configuration, comes into pressing contact therewith to stably constrain the fastening of the fixed sinker insert 5 between the clamping flange 32 and the upper base la .
  • the annular pad 7 is made of a soft material .
  • the clamping of the fixed sinker insert 5 is ensured by friction .
  • annular pad allows for any geometric tolerances existing between the thickness of the locking protrusion 1 and the space delimited by the clamping flange 32 and the upper base la to be compensated .
  • the sinker locking system 10 also comprises an outer crown 2 fastened to the cylinder 1 , preferably in proximity to the upper base la .
  • the outer crown 2 has an upper wall 20 in which radial grooves 200 are obtained, which are equally spaced apart from one another in the circumferential direction and each suitable for accommodating at least partially the tail portion 53 of a fixed sinker insert 5 resting thereon .
  • said radial grooves 200 are suitable for matching, in locked configuration, with the radial slits 350 obtained on the clamping crown 3 .
  • said radial grooves 200 are each suitable for accommodating the tail portion 53 of each fixed sinker insert 5 in such a way as to constrain it so as not to allow circumferential deviations thereof - unless low geometric tolerances .
  • each radial groove 200 has a greater thickness than the thickness of the tail portion 53 .
  • the locking protrusion 51 and the tail portion 53 form the base of the fixed sinker insert 5 , from which the fel ling protrusion 52 protrudes at the top and in an at least partially spaced apart manner .
  • the tail portion 53 of each fixed sinker insert 5 identi fies an upper rim 530 at the top .
  • the sinker locking system 10 also comprises movable sinker inserts 4 . Said movable sinker inserts 4 are suitable for cooperating with the fixed sinker inserts 5 to operate synergistically and synchronously with the needles of the cylinder to continue the working of the knitted fabric .
  • each movable sinker insert 4 of said movable sinker inserts 4 extends in a radial direction R between a toothed end 4a facing the central axis Z and a free end 4b opposite the toothed end 4a and is delimited at the bottom by a sliding edge 43 .
  • Each movable sinker insert 4 is accommodated in the same radial groove 200 of the respective fixed sinker insert 5 and is slidable on the upper rim 530 of the respective fixed sinker insert 5 . That is , the sliding edge 43 is suitable for sliding on the upper rim 530 guided by the radial groove 200 , preferably directly in contact therewith .
  • the movable sinker insert 4 slides directly in contact with the upper rim 530 of the tail portion 53 .
  • this embodiment makes the system adaptable to all circular knitting machines that provide a single radial groove - preferably made in two portions , one on the outer crown and one on the clamping crown - interposed between two axial channels for the needles and not requiring further work operations on the cylinder or on the outer crown to be performed .
  • each movable sinker insert 4 comprises a tooth 40 protruding radially there from at the toothed end 4a and suitable for gripping a thread being worked in the circular knitting machine while working in synchroni zation with a knitting needle mounted on the cylinder .
  • the tooth 40 faces the felling protrusion 52 of the fixed sinker insert 5 .
  • the movable sinker insert 4 carries the tooth 40 at its toothed end 4a and is operated in a sliding manner on the fixed sinker insert 5 so that the tooth 40 intercepts the thread in contact with the felling protrusion 52 and causes it to form the knitting stitch or the felling .
  • the sliding of said movable sinker inserts 4 is also actuated by cam mechanisms , preferably in a synchroni zed manner with the upward and downward motion of the needles .
  • a plurality of slots 6 are obtained in the upper base la of the cylinder 1 so that each is located at a radial slit 350 .
  • Said plurality of slots are preferably equidistant from each other circumferentially .
  • the slots 6 are part of a single annular groove obtained circumferentially on the upper base l a of the cylinder 1 .
  • the locking protrusion 51 of each fixed sinker insert 5 has a ridge 50 at the bottom which is engageable in the respective slot 6 of said plurality of slots 6 - or in the annular groove - to ensure the positioning of each fixed sinker insert 5 with respect to the radial direction R .
  • auxiliary slots 6a spaced apart from each other circumferentially - or, an auxiliary annular groove in addition to the aforesaid annular groove - are also obtained in the upper base la of the cylinder .
  • Such auxiliary slots 6a or such auxil obviouslyy annular groove are suitable for engaging the ridge 50 of each fixed sinker insert 5 in such a way that , when a fixed sinker insert 5 has signs of wear , said insert may be slightly translated into the respective groove 200 to take a second working position in the auxiliary slot 6a .
  • the present invention also refers to method of assembling a sinker locking system 10 comprising the following steps : [0085] - radially inserting the fixed sinker inserts 5 to place them at least partially interposed between the clamping crown 3 and the upper base l a of the cylinder 1 ; [0086] - stably constraining the clamping crown 3 to the cylinder 1 so as to lock the fixed sinker inserts 5 .
  • the present invention also refers to a disassembling method of a sinker locking system 10 compris ing the following steps :
  • the present invention also refers to a circular knitting machine comprising a sinker locking system according to the present invention .
  • the present invention solves the drawbacks of the knitting systems with fixed sinker typical of the prior art .
  • the sinker locking system according to the present invention allows for the use of fixed sinker inserts that ensure better working, without causing torsions on the thread sliding on the felling surface thereof .
  • the sinker locking system facilitates the insertion and assembly operations of the fixed sinker inserts , generating a consequent time savings and resulting in a gain in terms of piece production .
  • the s inker locking system in the embodiment which provides for the use of an annular pad, is suitable for compensating for any geometric deviations due to the working tolerances of the inserts and cylinders and allows for stable , optimal and reliable locking of the inserts .
  • this type of locking does not generate plastic deformations on the fixed sinker inserts . Consequently, these inserts may be reused even after being extracted from the cylinder following disassembly .
  • the sinker inserts are insertable and extractable from the locking system by simply sliding them along the radial groove thereof , from outside the cylinder .
  • This entails a huge advantage in the operational convenience of operators who do not have to intervene inside the cylinder in reduced spaces but may operate from outside the cylinder, also moving a large plurality of inserts simultaneously .
  • the sinker locking system according to the present invention is applicable to traditional knitting machines , as well as to machines that generally support movable sinkers , by making reduced modi fications to only the clamping crown and to the clamping cylinder to allow the releasable constraint thereof .

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)

Abstract

Ensemble de verrouillage de platine servant à verrouiller des inserts de platine fixes (5) pour une machine à tricoter circulaire comprenant un cylindre de tricotage creux (1) et une couronne de fixation (3) à l'intérieur dudit cylindre ; la couronne de fixation (3) comprend une bride de fixation (32) qui fait saillie de manière circonférentielle à partir de celle-ci face à une base supérieure da) du cylindre. La couronne de fixation (3) peut être retenue sur le cylindre de façon à fixer un insert de platine fixe (5) intercalé entre la bride de fixation (32) et la base supérieure da) du cylindre. Un système de verrouillage de platine (10) comprend ledit ensemble de verrouillage de platine et des inserts de platine fixes (5). Une machine à tricoter circulaire comprend ledit système de verrouillage de platine. L'invention concerne également un procédé d'assemblage et l'assemblage dudit système de verrouillage de platine.
PCT/IB2024/055396 2023-06-05 2024-06-03 Ensemble de verrouillage de platine, système de verrouillage de platine, procédés d'assemblage et de démontage dudit système, machine à tricoter Ceased WO2024252253A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102023000011376A IT202300011376A1 (it) 2023-06-05 2023-06-05 Assieme di bloccaggio platine, sistema di bloccaggio platine, metodi di montaggio e di smontaggio di detto sistema, macchina da maglieria.
IT102023000011376 2023-06-05

Publications (1)

Publication Number Publication Date
WO2024252253A1 true WO2024252253A1 (fr) 2024-12-12

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PCT/IB2024/055396 Ceased WO2024252253A1 (fr) 2023-06-05 2024-06-03 Ensemble de verrouillage de platine, système de verrouillage de platine, procédés d'assemblage et de démontage dudit système, machine à tricoter

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IT (1) IT202300011376A1 (fr)
WO (1) WO2024252253A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119411295A (zh) * 2025-01-06 2025-02-11 福建宝翔针织技术股份有限公司 一种单面针织圆纬机
CN119980557A (zh) * 2025-04-17 2025-05-13 福建宝翔针织技术股份有限公司 具备控制单元线圈的双色单面提花圆纬机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0458073A1 (fr) * 1990-05-22 1991-11-27 UNIPLET a.s. Dispositif de tirage pour des machines à tricoter
GB2261883A (en) * 1991-11-27 1993-06-02 Uniplet As Double-cylinder circular knitting machine
IT201700038900A1 (it) * 2017-04-07 2018-10-07 Alberto Pilotelli Cilindro degli aghi per una macchina da maglieria monofrontura
WO2023281328A1 (fr) * 2021-07-08 2023-01-12 Santoni S.P.A. Métier à tricoter circulaire avec sélection de platine et procédé associé de tricotage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0458073A1 (fr) * 1990-05-22 1991-11-27 UNIPLET a.s. Dispositif de tirage pour des machines à tricoter
GB2261883A (en) * 1991-11-27 1993-06-02 Uniplet As Double-cylinder circular knitting machine
IT201700038900A1 (it) * 2017-04-07 2018-10-07 Alberto Pilotelli Cilindro degli aghi per una macchina da maglieria monofrontura
WO2023281328A1 (fr) * 2021-07-08 2023-01-12 Santoni S.P.A. Métier à tricoter circulaire avec sélection de platine et procédé associé de tricotage

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119411295A (zh) * 2025-01-06 2025-02-11 福建宝翔针织技术股份有限公司 一种单面针织圆纬机
CN119411295B (zh) * 2025-01-06 2025-04-11 福建宝翔针织技术股份有限公司 一种单面针织圆纬机
CN119980557A (zh) * 2025-04-17 2025-05-13 福建宝翔针织技术股份有限公司 具备控制单元线圈的双色单面提花圆纬机

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